Python Function

def addition(x, y):
    return x + y

Python Lambda

addition_lambda = lambda x, y: x + y

• lambda keyword
• Parameters list
  (any valid Python parameters)
• Single expression

Python Lambda

class Calculator:

    @staticmethod
    def addition(x, y):
        return x + y

    def operate_binary(self, a, b, operation):
        return operation(a, b)

    @staticmethod
    def main():
        calc = Calculator()
        subtraction = lambda x, y: x - y
        print("40 + 2 = {}".format(calc.operate_binary(40, 2, Calculator.addition)))
        print("20 - 10 = {}".format(calc.operate_binary(20, 10, subtraction)))
        print("7 * 6 = {}".format(calc.operate_binary(7, 6, lambda: x, y: x * y)))

if __name__ == "__main__":
    Calculator.main()

Python Lambda

def process_persons(roster, filter, mapper, action):
    for p in roster:
        if filter(p):
            data = mapper(p)
            action(data)


process_persons(roster,
                lambda p: (p.gender == MALE and
                           p.age >= 18 and
                           p.age <= 25),
                lambda p: p.email_address,
                lambda p: print(email))